Here is a left and right handed MLOK thumb rest for ACC chassis, uses a single M-Lok nut and screw

These have been tested on MDT chassis but should work on any MLOK compatible forward grip.

Best printed in ASA or CF-Nylon.

I added them to both sides of the chassis for the odd time we shoot off side/hand

If you prefer to buy this product pre made, you can find a link to webstore here https://www.hitthat.ca/product-page/thumb-restkit